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  <meta charset="UTF-8">
  <title>Document</title>
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  <script>
    // var hd = '后盾人';

    // symbol其实就是生成一个不会与其他任何值相等的值
    let hd = Symbol();
    // let hd = Symbol();
    let houdun = Symbol();
    console.log(hd === houdun);


  </script>


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